Space Quest is (for me) one of the funniest series ever made. Because the graphics were limited they had to put an emphasis on dialogue.. and so you get hilarious stuff like this:
"My, this is one hot planet! But you don't care; you're protected with Thermoweave Underwear!"
"Narrator: You get the ladder and put it in your pocket. Ouch."
"So, how do you like the game so far? Was it worth the $59.95?"
And Curse of the Monkey Island had many moments that made me laugh a bunch, such as seeing a button in the options section that read "Enable 3D Acceleration". If you're as gullible as me and you press it, you'll get messages like "We were only kidding" and "No, really, there's no 3D acceleration in this game!"